//
// Created by wze-zero on 2024/8/25 025.
//
#include <iostream>

#define PI 3.14
#define W 10000
using namespace std;

int main() {
    int h, r, num = 1;
    cin >> h >> r;
    while (PI * h * r * r * num < W) {
        num++;
    }
    cout << num << endl;
    return 0;
}